Yep, GTRs run hot when giving them a bit of a hammering. I have been warned by many people now not to even think about taking the GTR to Q.R. until I have a nice oil cooler, a decent sump baffle setup, bigger oil pump, and bigger radiator. This has been told to me by Ernie (Skyline imports), Gavin Woods, Bruce (LEDA suspension) to name a few, and Sydneykid has also mentioned this. So unitil these things are completed on me car, my Sprint Events at Q.R. are over, not taking the risk.
I can get the oil temp in mine to the "near danger zone" with a quick drive through the mountains, hate to think what it could get to on the track.